Twin-bar support



, 1,621 1s4 March 15, 1927 E. WHITE I TWIN BAR SUPPORT Filed July 26, 1926 .72 l C-tfi I I 7 emor' Patented Mar. 15, 1927.

.VJ'ILLIA M E. WHITE, OF CHICAGO, ILLINOIS, ASSIGIN'OBI. TO KALMAN STEEL COMPANY OF CHICAGO, ILLINOIS, A CDRPQRATION OF DELAWARE.

TWIN-BAR SUPPORT,

Application filed. July 26, 1926. I Serial No. 124,974.

My invention relates to reinforcement for concrete and particularly to a chair for use in connection with twin bars intended for road reinforcement.

A number of different forms of chairs adapted for the described use have been suggested, all, thereof having some objections that are believed to have been over come in the design here disclosed.

A. requirement of a chair for this purpose is that the legs or supports for the bars shall provide a certain area of metal for reinforcement, this area being approximately one half of the area of the bar supported thereby. As a consequence of this requirement, the chair has been composed in its entirety of wire rods of relatively large size. However, there is no requirement for similar strength in the element connecting the bars and the use of this excess material results in increased weight with no corresponding advantages. In the device here disclosed, the requisite cross sectional area of material is furnished in the legs with a reduced area in the connecting members.

Furthermore, the devices heretofore used have been but poorly adapted for complete assembly in the factory, it being common to assemble the chairs and bars in the field with generally unsatisfactory results. Furthermore, when wire rods of relatively large cross section are employed, there is difficulty and frequent breakage by attempting to twistthe same around the relatively small reinforcing bars.

In my device I utilize wire rods of small cross sectional area, and adapt the construction to complete fabrication in the shop.

The invention will be more readily understood by reference to the accompanying drawing, in which;

Fig.1 is aplan view showing the first stage in the manufacture of the chair;

Fig. 2 shows the second stage;

Fig. 3 is an end elevation of a completed device;

Fig. 4 is a perspective view of a plurality of devices in position, and;

Fig. 5 is a side view of the completed device.

In the drawings two reinforcing bars are indicated at A and B. It is the requirement in some localities that two of such bars be used at a certain position in the road, and that the bars be. supported at frequent intervals bychairs, the legs of which shall stage of operation, the loops are bent upwardly into their final position, and the free 1 ends, 12, 13, are bent out of the original plane into the form of open hooks. While in this position, the bars indicated in dotted lines in Fig. 2 are dropped in place and the free ends, 12, 18 bent around into the position shown in the succeeding figures. This leaves a connecting member, 14', composed of r a single length of wire.

Preferably, the connecting member 14 is depressed below the plane of the tops of p the bars, thus providing a pocket, 15, at the angle between the legs and the connecting member. The bars are received and firmly held in the so-formed pockets with the advantageous result that the said bars are restrained from relative longitudinal shifting. The two points of connection, that is, the hooks, 12, 13, and the pocket, 15, being spaced apart serves to prevent relative movement between the bars. 7

It will be noted that the legs are preferably flared somewhat to insure elficient nesting forshipping; also that by shaping-the wire to form the wide loops, a relatively large ground-contacting area is provided, thus minimizing the tendency of the struc ture .to sink into the soil; also that the legs are staggered to the extent of the wide loops,

as shown in Fig. 5, and that the connecting member extends straight across, or is normal to, the bars. This is to insure better supporting and bracing functions.

The device is formed and assembled in three simple bending operations, and is firm and rigid when assembled. It provides for the requisite reinforcement without excess weight, and adapts itself vto, variations in requirements without material change in manufacturing equipment. The chair and bars are relatively permanently united prefera-bly in the factory and are handled, shipped and installed as a permanently assembled unit as distinguished from those constructions in which the chairs and bars structure shown and I do not'wish to be limited except as indicated in the appended claims.

I claim:

1. A chair for supporting a pair of par allel bars comprising a channel shaped Wire structure adapted to engage the bars at the angles of the channel, the legs of the structure being composed of two Wires and the connecting member being composed of a singleiwire, the free ends o1 the Wires com-- posing the legs being bent around the respective bars.

2. A chair for supporting a pair of parallel' bars comprising a Wire rod bent into an inverted channel shape, the legs of the channel being in the form of elongated loops, the free ends of the rod being bent around the respective bars at the angles of the channel. p

3. A road reinforcing structure comprising a pair of parallel bars and a plurality of chairs permanently secured to the bars, said chairs being composed. of a single length of Wire bent into generally U shape, the Wire composing the legs being doubled on itself to form loops, the free ends of the rebent portions being turned around the bars.

4:. A road reinforcing structure comprising a pair of parallel bars and a plurality of chairs permanently secured to the bars, said chairs being composed of a single length of Wire bent into channel shape, the

Wire composing the legs being doubled on itself to tormloops, the free ends of the rebent portions being turned around the bars at-the angles of the channel, the connecting member of the structure being a single Wire.

5. A road reinforcing structure comprising in combination, a pair of'parallel bars and a chair periianently secured to the bars, said chair comprising a Wire rod bent into channel shape, the legs of the channel being in the form of loops, each loop underlying and supporting a bar, the terminal portion of one of the members of each loop being bent around the respective bars.

6. A road reinforcing structure comprising, in combination, a pair of parallel bars and a chair, said chair being composed of a single length of wire bent into channel shape, the end portions of the Wire being rebent to form loops constituting legs, the

end portions of the Wire being bent around the respective bars at the angles of the channel.

7. A chair {or supporting a pair of paraliel bars consisting of an inverted channelshaped Wirestructure adapted to engage the bars at the angles of the channel, the connecting member of the structure being coin posed. of a singie Wire, the Wires composing the legs of the structure being bent around the'respective bars to permanently secure the chair to the bars.

In testimony whereof I have affixed my signature.

WILLiiii i E. Writt'rn; 

